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Photography of Faint Transient Light-Spots (1933)

RICHARDSON, L. F.

[s.l.] : Nature Publishing Group

Nature 131 (1933), S. 401-402

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] PROF. H. HARTRIDGE in his letter in NATURE of January 21, expresses the need for “A lens having a numerical aperture of 0.8 or 0.7, a focal length of 25–50 mm. and adequate definition on the film over an area of 3–5 mm.” It is perhaps not commonly noticed that a Mangin lens-mirror out of a ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/131401b0

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